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Hi Bobby, no sir, this is for a weaver style rail. The Ruger 57 takes adapter plates. Available adapter plates here >>> https://shopruger.com/searchprods.asp

Hi Bobby and welcome. No Sir, this has a Weaver-style mounting system for Weaver or Picatinny Rail Mounting. It will mount to a Ruger 57 LC Carbine no issue. Cheers and stay safe!